Intrinsically stretchable fully π-conjugated polymer film via fluid conjugated molecular external-plasticizing for flexible light-emitting diodes.

Interestingly, the photoluminescence quantum yield (PLQY) shows an increasing trend as the doping ratio of conjugated molecular additives (Z1, Z2) increases, as shown in Fig. 2c , increasing from 33% to 49% and 41% for Z1, Z2, respectively.

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More interestingly, the current density and luminance of the devices based on the F8BT blend films show a decreasing trend as the doping ratio increases, but unlike the Z2/F8BT blended film, the Z1/F8BT blended film still maintains 70% of the initial luminance at 20 wt%, and this corresponds to the maximal crack onset strain.

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